Problem One QC process need to obtain tables and their row counts in a database in Netezza. We use the below SQL query to do so: )) TABLE_NAME, ) ) ) * RELREFS) + ( RELTUPLES ) END AS BIGINT) NUM_ROWS FROM _T_CLASS ,_T_OBJECT ; Now oneday an issue oc…
Introduction External table is a special table in Netezza system, which could be used to import/export data between flat files and Netezza directly. Import data from external file to Netezza Grammar: CREATE EXTERNAL TABLE EXTERNAL_TABLE_TEST ( id in…
FROM: http://tennysusantobi.blogspot.com/2012/08/netezza-external-tables.html Netezza External Tables You can use Netezza's external table to view data from an external file and use it like a database table. When you create an external table, the a…
mysql中You can't specify target table <tbl> for update in FROM clause错误的意思是说,不能先select出同一表中的某些值,再update这个表(在同一语句中). 如下l: 需要将select出的结果再通过中间表select一遍,就可以规避了错误. 如下: PS:这个问题只出现于mysql,sql service 和 oracle 不会出现此问题.…